#35 Download directory selection under Ubuntu 13.04

[Kallisto]

Download directory not saved under Ubuntu 13.04. Steps to reproduce:

1. Open Flush preferences window.
2. Choose a download directory.
3. Close the window with OK button.
4. Re-open the preferences window. Note that the download directory not set.

Workaround: Set the directory manually in ~/.flush/client.conf, attribute user : download_to.